It's the Teams night off so Natasha, Tony, Steve, Thor, Loki and Bucky decide to go to a nearby Karaoke Club. The Club was extremely empty so it was just the team and a few staff members that were on the Night Shift.
The team sat down at the small tables, Tony and Natasha at the furthest from the door. Tony who ordered all the drinks and Natasha who would drink them then get into an argument with Tony about having her feet up on the table. In the middle of them were Steve and Bucky, who Both Natasha and Tony had a bet on.
The Bet was simple, Natasha bet's Steve will make a move on Bucky first and Tony bet's Bucky will make a move on Steve first. In Tony's argument, 'I doubt the holy Captain America would give in to his desire'.And on the table to the right was Thor and his brother Loki, who refused to come along but was forced to by his brother.
The team didn't do much Karaoke to start with, it was more just drinking and chatting to each other. Of course, Thor had brought along Asgardian liquor for himself and the two super soldiers. Eventually, after several rounds of drinks the music started and the team started bellowing the lyrics. First to Somebody To Love by Queen, followed by Thrift Shop and then their recent song currently being sung is Last Friday night (T.G.I.F).
Thor raised his glass,
"Last Friday night!"
Loki Grumbled along,
"Yeah, we danced on tabletops-"
And the team ended up shouting over each other until they accidentally knocked down a couple of glasses. Tony cleaned them up as Bucky asked if he and Steve could sing on the stage. Steve's face grew a confused expression but he simply shrugged, following Bucky onto the stage.
Natasha and Tony looked at each other, smug looks spread across both their faces as Lay All Your Love On Me from Mamia mia started playing, Stark whispered,
"You owe me 10 bucks, Romanoff".
Steve stood on stage as Bucky smirked slightly, holding a microphone in his hand, beginning to sing the lyrics,
"I wasn't jealous before we met, Now every man that I see is a potential threat"
Bucky Sang into the microphone, as a Blush spread across Steve's face.
"And I'm possessive, it isn't nice. You've heard me saying that smoking was my only vice..."
Bucky span steve around making him lose balance, bright red in the face, Not completely understanding what's happening.
"But now it isn't true... Now everything is new..."
Bucky stepped closer to Steve, looking up at the blue-eyed man smiling with a rose-red blush,
"And all I've learned, Has overturned, I beg of you!"
With the last line, Bucky got on his knee's making dramatic hand gestures as Steve's blush grew but he laughed at his friend.
At this point, Natasha and Tony were both sitting there, smug of themselves as Thor clapped smiling at his friends and Loki grumpily sipped his Capri Sun.
Working up the courage, Steve grabbed the Mic looking down at his friend,
"Don't go wasting your emotion, lay all your love on me!"
Steve bent down, tilting up Bucky's chin making the other man smirk. The two men stood up, as Steve walked forward, making Bucky walk back.
"It was like shooting a sitting duck, A little small talk, a smile and baby I was stuck."
Steve nearly dropped his microphone but was caught by Bucky who tossed it back to the blonde.
"I still don't know what you've done with me, A grown-up man should never fall so easily".
Bucky sang, adding a dramatic shrug.
"I feel a kind of fear..." Steve Sang, Bucky joining in,
"When I don't have you near..."
The Two sang over each other,
"Unsatisfied, I skip my pride. I beg you dear!"
The whole team was clapping along, wolf-whistling as the two sung."Don't go wasting your emotion, lay all your love on me!"
Bucky sang, smirking,
"Don't go sharing your devotion, Lay all your love on me!"
The Music continued, Steve taking over.
"I've had a few little love affairs, They didn't last very long and they've been pretty scarce..."Bucky laughed, hanging his shoulder around Steve,
"I used to think that was sensible, It makes the truth even more incomprehensible".
The Two turned to face each other, noses just inches away from the others as they both sang,
"Cause everything is new, And everything is you, And all I've learned. Has overturned. What can I do?"
Bucky put his hand against Steve's chest, making the blonde bend down slowly to the floor.
"Don't go wasting your emotion..."
Bucky stroked Steve's jawline, causing the other to blush again as He chocked out the lyrics,
"Lay all your love on me."
Bucky smirked, holding the back of Steve's neck,
"Don't go sharing your devotion, Lay all your love on me!"
The Two kissed, causing a blush to form on Steve's face. Tony and Nat clinked glasses and Thor clapped as Loki raised an eyebrow, sipping his juice.

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Stucky x Mama Mia
FanfictionThe Avengers have a night off and decide to go to a karaoke bar, Steve and Bucky are one Stage. Things get good from there.